Startup website CondoCompare Inc. will roll out in California next month as the first step in a national expansion.

The Seattle-based online real estate brokerage plans to operate in 11 states by year's end, said co-founder and President Brett Frosaker. The expansion will give CondoCompare access to some 50 metropolitan markets, he said.

The website, which currently operates in Washington and Oregon, plans to provide its comparison shopping service for condo buyers in Colorado, Arizona, Nevada, Texas, Ohio, Illinois, Georgia and Florida.

The company has already hired real estate brokers in these states and is in the process of joining each state's multiple listing service.

CondoCompare aggregates data from multiple listing services, enabling website visitors to compare condominium projects in various neighborhoods by price range, number of bedrooms and bathrooms, units available and price per square foot. Users can also compare individual units by price, homeowners' dues, taxes and features.

"We are baking our technology; we want to use the Seattle market as a test," Frosaker said. "When we get to California, that market is five times the size of the Puget Sound area. That's where the rubber will hit the road."

The startup has raised about a half million dollars of an initial $2 million Series A funding round that will be used to pay for its national expansion. The company, which launched last May, began marketing its services earlier this year.

Frosaker teamed up with CondoCompare CEO Casey Sullivan in setting up the condo search site. Both are veterans of the local residential real estate market. Sullivan is a local real estate developer and former mortgage banker, while Frosaker operates the residential real estate brokerage Columbia Real Estate Group and publishes a bi-monthly local newsletter on condo sales called the Fat Report.

CondoCompare has 11 employees. The company is also working with four advisers, including former Microsoft executives Pascal Stolz -- who is CondoCompare's sole board member -- and Henry Lin. A former Shopnow.com executive, Stolz is now CEO of the website Alerts.com. Lin is co-founder of the handbag company, Chelsey Henry.

Other advisers include Barney Guy, formerly with MILA, a Mountlake Terrace mortgage originator that shut down last year, and venture capitalist Byron McCann of Seattle-based Ascent Partners, who also worked with HouseValues.com.

Frosaker anticipates CondoCompare is about six months away from profitability.

"Our burn rate is relatively low," he said, "most of our money has been spent on expansion."

The company has two sources of revenue: One is from referral fees from agents closing condo sales generated through its website. The other is advertising revenue from online ads. The website includes a button that visitors can push to set up a condo tour in as little as 30 minutes with one of CondoCompare's affiliated real estate agents.

In addition to its own real estate agents, CondoCompare also partners with outside real estate agents who agree to pay a referral fee on sales coming to them through the website. To qualify as certified CondoCompare partners, these real estate agents must have at least three years experience, have closed at least 10 condo transactions and be in the top 20 percent in sales in their office.

While it's possible to obtain the information on the website but not work with CondoCompare agents, the company hopes to woo customers by offering quick, high quality service.

"If you can go to the site and get great information that's in context, then immediately have someone ready who will show you the condo, we believe that will be a huge tool," Frosaker said.

The website is generating about 195,000 page views a month, Frosaker said. It has participated in about 20 closed sales, with Frosaker expecting that number to climb now that the company has started marketing its services.

Starting in April, CondoCompare will add new features, including letting website users rate real estate agents and condominium buildings. Site visitors will also be able to blog about neighborhoods where condos are located.

The company is also adding some "sticky" features to keep visitors coming back to the site, including setting up user accounts that provide customers with automatic e-mail updates on the various condominium properties that interest them.